Talking-machine sound-box.



A. JUNOD.

TALKING MACHINE SOUND BOX.

APPLICATION FILED FEB. 27, 1998.

905,082. Patented Nov. 24, 1908.

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ail 73 Z3 WITNESSES INVENTOR 52091? 72062 T RNEY A JUNODP TALKING MACHINE SOUND BOX.

APPLICATION FILED FEBLZI, 1908.

Patented Nov. 24, 1908.

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IINVENTOR;

S E S 5 E N H w ATTORNEY ANDRE JUNOD, OF FRUITYALE, CALIFORNIA.

TALKING-MACHINE SOUND-BOX.

Specification of Letters Patent.

Patented Nov. 24, 1908.

Application filed February 27, 1908. Serial No. 418,070. i

To all whom it may concern: f

Be it known that I, ANDRF] JUNon, citizen of the United States, residing at Fruitvale,

- in the county of Alameda and State 0t California, have invented new and useful Improvements in Talking Machine Sound Boxes, of which the following is a specification.

My invention relates to sound-boxes for talking machines and especially to novel ,means for mounting the stylus bar of such a sound-box in such a manner as to make the apparatus extremely sensitive, and to accurately reproduce the recorded vibrations.

It consists in the combination of parts, and in details of construction which will be more fully explained by reference to the accompanying drawings, in which? 1 Figure l is'a plan view ofthe reproducer.

Fig.2 is avertical section of the same, taken through m.w of Fig. 1. Fig. 3'is a view looking toward the side of the apparatus in line with the stylus bar. Fig. 4 is a diagrammaticview showing the position of the pins and their combination. Figs. 5, 6 and, 6 are modifications ofthe tensioning means. Fig. 7 is a section transverse to the groove of one of the bearing studs. Fig. 8 is a sec tional' view through the bearing points. Fi 9 is a similar view showing straight knife edges, and a U-shaped spring. Fig. 10

is a sectional elevation of the same through the center of the reproducer. Fig. 11 is a plan View showing the sound-box ring used as a tension lever. Fig. 12 is a sectional elevation of the same on lines 11, y ofFig. 11. Fig. 13 is a diagrammatic View of the stylus" bar. Fi s. 14, 15, 16 and 17 are views showing modified forms of bearings for the ring.

Various devices have been made in connection with this class of apparatus for. the proper tensioning of the stylus-bar, and to provide a construction which will prevent secondary vibrations; and it is the object of my invention to provide a compact construction to employ substantially rigid tensioning devices which are not subject to' give way under pressure, or become loosened so as to put the stylus bar out of operation.

In my construction, the tensioning or engagement point on, the stylus bar, is located The plate 3 secured to the casing '1 is proknife edges 11 formed in the holes 7 and 8, of

the transverse bar 6, shown in Fig. 3. The stylus bar 9 is connected with the center of the diaphragm 2 in the usual orany suitable method, and the needle or stylus is clamped to the outer end of the bar by means of a thumb screw 18 in the boss 14 of the transverse bar 6. The diameter of the cir cular knife edges a and a of the bar 6 is slightly larger than the diameter of the studs 4 and 5, so that the bar can be easily removed from its bearings. The transverse bar 6 is provided in its center, and in the same plane with the knife edges a and a with a conical recess 15, located onvthe rear and outside the bearing points of the knife edges a and a and the studs 4 and 5, as plainly shown in Fig. 3. The compression pin' 13 is pressed or forced against the bottom'of the recess 15, by'means of an adjust-- ing-screw 11, and this is retained in position by means of a set screw 12 adjusted in the split stud 10 of the plate 3. There are no springs provided in this construction as it is intended that the mounting of the stylus bar and adjusting screw, and the studs 4, 5 and 10 on the thin plate 3, will be suflic'iently yielding to assure an accurate adjustment for an indefinite'length of'time. The plate 3 may preferably be made thinner at an intermediate portion, as plainly shown at 19 Fig. 2, and this will increase the yielding lefi'ect.

In Fig. 5 .I have shown a spring 17 which may be used in place of the stud 10 and adjusting screw 11. This spring is simply screwed on the side of the sound-box casing, and its projecting end bears upon the compression pin 13.

In Fig. 6 I have shown the adjusting screw 11, and the compression pin 13 made in a single piece, and. made elastic at the point a In Fig. (3" I have shown the parts 11 and 13 made separate and connected by means of a small star or other shaped spring 16; these modifications all serving to produce the required elasticity. The relative position of the pins 13, and the lever formed by the transverse bar 6 are plainly shown in Fig. 4, in which 9.1 is the fulcrum or bearing point of the stylus bar. 22 is the compression or tension point of the two combined elements 6 and 13; this tension point being located on one side of the fulcrum of the bar, and the stationary point 23 upon the other side of the fulcrum 21 The are described by the pin 18' tilting about the fixed point 23 being of larger radius than the are described by the lever or stylus bar tl'tilting on the other" fixed point 21, and the two parts being connected at the point 22, it will be evident that by each had oscillation of the stylus bar or lever 6, there will be a pressure exerted onthe point 23, and the "two parts will have a tendency to come into a position in which the three points 2.1, 22

and 23 will lie in a straight line; and an elastic mountingtor each half oscillation'of the diaphragm is thus provided.

, In. Fig. l! I have shown in a diagrammatic view a further illustration of the operatioii of this device. Supposing the stylus bar lever 6. and the compression or tension pin 1.3 to be of the same length, the stationary point 23, and the fulcrum point 21 will coincide, and the arcs described by the move- 'ment of the two parts will also coincide, so

thatthere will be no tension at all on the diaphragm for each half oscillation. This differs from devices in' which the tension points are both on the same side of the fulcrurn, since in that case the oscillations of the parts take place in arcs which are tangent to .each other, and the curves thus diverging from the common point there will be an increased tension on each side during the oscillations of the diaphragm.

By reason of the are described by the stylus bar'in my devicebeing upon the inside of the are described by the compression member,

it will be seen that the pressure will be very little increased during each half oscillation, and the stylus bar will vibrate more freely, and with a greater amplitude of vibration of the diaphragm, thus iving a louder and clearer tone. Another a vantage of my device is that great sensibility can be obtained by the use of members of nearly the same length, and the apparatus thus pro vides a very sensitive and elastic mounting for the stylus bar responsive to minutest sound wave movement, and a greater ampli tude of vibrations of the diaphragm, with a corresponding loud, distinct and natural tone.

In the modification shown in Fi 8, the stylus bar and the tension'means are placed in the plane of the diaphragm. The stylus bar is pressed upon its seats: by means of an adjusting screw and nut as at 25, between the stationary sound-box casing and the stylus, bar. In Fig. 9 I have shown this adjusting screw and nut as replaced by a U- shaped spring 25 having a point pressing on the stylus bar, and two other points on a small sl de 27 which can be adjusted by s so 27". The tension of the knife edges tact point formed. at one side 0.

ounces spring may be adjusted by uu'uus of a screw 26.

In Figs. ll to 16 inclusive the sound-bur; ring is not itself employed as a cmupressiou member, beingyuljustcd on studs it? upon I-ll.

The adjusting screw which engages the stylus bar can be set in position by me 3 screws 25, the ring being split so loosen the adjusting screws.

Having thus described my invention, what I claim and desire to secure by Letters l at out is- 1: In a sound reproducing ma ':hiuc, thx combination with a sound-box asing, a diuu, a stylus bar and a bearing located iur to the sound-Mix casing, of" a ten sioning device having an en; fillltzl'ri} poin on the stylus bar located on one side of the fulcraun of said bar and a stationary point located upon the other side ofsaid fulcrum.

2. In a sound rep; oducing machine, a sound-box. casing, a diaphragm and stylus bar, a bearing theiefor located exterior to the sound-box, a tensioning or engagement point located on the stylus bar at one side of the fulcrum of said bar, and a stationary point of support upon the opposite side.

3. In a sound reproducing machine, a sound-box casing, diaphragm and stylus bar, a bearing'or fulcrum for said bar, :1 voui: said tul crum, a compression device hav end of the co 4 4. In sound sound bor easin taro al studs, and (01 .srcter. Slllt (es and hi l -ari .said ea iu urchins, the tylus bur. "3"?45 5'" beadn for the stylus bar, Stilt I mg carried upon theplate, a contact point in the stylus. bar at one side of the bearings, fixed polut carried upon the opposite edge of the plate and exterior to the bearings, (llltl.

a tensioning bar having its ends cngagim';

respectively the contact points.

6. In a sound reproducing device of the character described, a sound-box having a plate fixed transversely to one side and projecting therefrom, a diaphragm, a stylus bar having one end fixed to the diaphragm, a transverse bar to which the other end is fixedy circular, eo-acting groove and knife edge bearings carried by the plate, and upon which the transverse bar is capable t If on i l ti oscillation, a bearing point upon said bar at In testimony whereof I have he 'ennto set one side of the-fulcrum point, an adjustable my hand in presence of two subscribing Witpoint and a support therefor carried .upon nesses.

the outer edge of the plate and upon the ANDRE JUNOD. 5 Opposite side of the fulcrum, and a tension- Witnesses: t

ing barhaving its opposite ends engaging GEO. H. STRONG,

the two contact points. CHARLES A. Pmwmnn 

